John jay tonkin



.L t e e h. s P t e e h S 2 N I K N 0 T J I a d 0 M o m STEAM BOILER.

No. 448,867. Q

Patented Mar. 24, 1891.

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J. J.'TONK.IN. STEAM BOILER.

No. 448,867. Patented M 4. 24, 1891.

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' INVENTOR= 4 7% 2 244 NITED STATES ATENT FFIC-E.

JOHN JAY TONKIN, OF OSWEGO, NEW YORK, ASSIGNOR TO THOMSON KINGSFORD, OFSAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 448,867, dated March24, 1891.

Application filed July 25, 1890- Serial No.359,881. (No model.)

To all whom it may concern:

Be it known that 1, JOHN JAY TONKIN, of

Oswego, in the county of Oswego, in the State of New York, have inventednew and useful Improvements in Steam-Boilers, of which the following,taken in connection with the accompanyingdrawings, is a full, clear, andexact description.

This invention relates to the class of steamboilers which are formedwith a water-leg or water-jacket surrounding the fire-box, and have anopening through the bottom of the fire-box and subjacent water-jacketfor the escape of ashes from the fire-box.

The object of my present invention is to dispense with the usual extrawater rings or frames which have heretofore been interposed between theinner and outer shells around the openings thereof to form the junctionbetween said shells at said openings, and also to reduce to a minimumthe number of seams in the fire-box, and thus not only save time andlabor in constructing the boiler but also reduce the number of rivetsrequired andrender the boiler stronger and more durable; and to that endthe invention consists in the novel construction and combination ofparts hereinafter fully described, and specifically set forth in theclaims.

In the annexed drawings, Figure 1 is a vertical longitudinal section ofthat portion of a steam-boiler to which my improvements pertain. Fig. 2is a vertical transverse section on line m m, Fig. 1; and Figs. 3 and 4:are enlarged detached perspective views, respectively, of the frontplate and bottom plate of the fire-box shell.

Similar letters of reference indicate corresponding parts.

B represents the inner or fire-box shell, and O the outer orboiler-shell, both of which are formed with coincidingopenings 0 and p,respectively, at the front for the feed-door and at the bottom for thegrate (Z, which latter is indicated by dotted lines in the drawings. Thefront and bottom plates of the outer shell or boiler-shell I preferablymaintain each in a uniform plane to the edges of the openings 0 and 19,and join thereto around the said openings the firebox shell B, withoutthe intervention of the usual extra waterrings. This I accomplish byforming the front plate a of the inner shell seamless and with theoutwardly and reverse curved portions 0 0 around the opening 0 all inone piece, as more clearly shown in Fig. 3 of the drawings. Theseportions of the inner shell extend to the front plate of the outer shell0, and are riveted directly thereto along the edges of the openings 0thereof, as shown in Fig. 1 of the drawings.

The usual extra water-ring heretofore employed between the inner andouter shells around the bottom openingpI dispense with by forming theinner shell B with a bottom plate Z), which is formed in one piece withthe inner side plate sections b b, and downwardly and reverse curvedportionsc c", as best shown in Fig. at of the drawings. These latterportions 0' c of the bottom plate I) extend to the bottom plate of theouter shell O, and are riveted directly thereto without the interventionof the extra water-ring, as clearly shown in Fig. 2 of the drawings.

Having described my invention, what ,I claim as new, and desire tosecure by Letters Patent, is

1. In combination with the outer shell O, having its bottom plate formedwith the opening 13, the inner shell B, having its bottom plate 5 formedwith the inner side plate sections 12 b and downwardly and reversecurved portions 0 c, all in one piece and riveted directly to the bottomplate of the outer shell without the intervention of an extrawater-ring, as set forth.

2. In combination with the outer shell 0, having its front plateprovided with the opening 0, the inner shell B, having its front plate aformed with the outwardly and reverse curved portions 0 c, all in onepiece with said front plate and riveted directly to the front plate ofthe outer shell along the edges of its opening,substantially asdescribedaudshown.

In testimony whereof I have hereunto 5

